The EU has all of those problems as well (UK, IE, MT are right-hand drive) and its been a success in my opinion. I'm not sure if the AU is ready to go as deep a

The EU has all of those problems as well (UK, IE, MT are right-hand drive) and its been a success in my opinion. I'm not sure if the AU is ready to go as deep as common currency. A unified trading block makes trading with larger nations a lot more even.